本文選題：突出前兆微震響應 + 激發(fā)階段��； 參考：《煤炭學報》2017年05期

【摘要】：為揭示煤與瓦斯突出的前兆特征,進行了4次大型突出模擬試驗,并用微震設備實時連續(xù)監(jiān)測,深入分析突出激發(fā)階段的微震響應信號,獲得突出前兆微震事件分布、雙譜估計及其時間演化等特征。結果表明:激發(fā)階段微震信號主要集中在第6頻帶,其頻響范圍為1 250~1 500 Hz;前兆微震事件主要分布在活躍期,具有間歇發(fā)生的特點;雙譜估計值數(shù)量級包括10~3,10~4,10~5,10~6和10~7m V~3,呈正態(tài)分布,但控制其發(fā)展趨勢的是數(shù)量級為10~7m V~3的前兆微震事件;臨突前有一段調整期,表現(xiàn)為低能量事件密集發(fā)生直至平靜期出現(xiàn),隨即發(fā)生突出。調整期與突出強度、持續(xù)時間正相關,是預警煤與瓦斯突出的重要信息。
[Abstract]:In order to reveal the precursory characteristics of coal and gas outburst, four large-scale outburst simulation tests were carried out, and microseismic equipment was used to monitor the microseismic response signals in the stage of outburst excitation, and the distribution of outburst microseismic events was obtained. Bispectral estimation and its time evolution. The results show that the microseismic signals in the excitation stage are mainly concentrated in the sixth frequency band with the frequency response range of 1 250 ~ 1 500 Hz, and the precursor microseismic events are mainly distributed in the active period and have the characteristics of intermittent occurrence. The bispectral estimates are of the order of magnitude of 10 ~ (3), 10 ~ (10), 10 ~ (10), 10 ~ (10) and 10 ~ (7) m V ~ (3), showing a normal distribution, but the trend of its development is controlled by a precursor microearthquake event of 10 ~ 7 m V ~ (3), and there is a period of adjustment before the upsurge, which shows that the low energy event occurs intensively until the quiet period, and its development trend is controlled by the precursor microearthquake event of the order of 10 ~ 7 m V ~ (3). Then came prominence. The adjustment period is positively related to the outburst intensity and duration, which is an important information for early warning of coal and gas outburst.
【作者單位】： 河南理工大學瓦斯地質與瓦斯治理國家重點實驗室培育基地;河南理工大學安全科學與工程學院;中原經(jīng)濟區(qū)煤層(頁巖)氣河南省協(xié)同創(chuàng)新中心;
【基金】：國家自然科學基金資助項目(51374094,40872191)
【分類號】：TD713.2

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